Sterilizing oven



NOV. 14, 1933. JQBOEKEL 1,935,499

STERILIZING OVEN /A Filed Jan. 20, 1933 i 15 vilizing chamber, whereby the temperature of the tion 12 and the oven 'casing A1.

Patented Nov. 14, 1933 lj f. a l 1,935,499A

UNIT-ED STATES l11.191511:Nr" clerics sTEaILIziNG .o vEN Y -Julus Boekel, Philadelphia, Pa., assigner to Wm. Boekel & Company, Inc., Philadelphia, Pa., a corporation of Pennsylvania 1 Application January 20, 1933. serial No. 652,765 k 5 Claims. (el. 16v- 3) This invention relates to new and useful imwalls 7y anda roof or top member 8 having aperprovements in st eriliaing ovens and has particutures 9 therein to form a sterilizing chamber A lar relation tosterilizing ovens of the so-called within the casing 1 substantially as shown in Fig. circulating hot air type. 'i 4 1 of .the drawing, and abottom 10 having aperl 'I heV principal object of the invention is to protures 1l therein is secured to the walls 7- adjacent 60 vide adevice of the character described wherein the bottom thereof to complete the sterilizing the temperature of the sterilizing chamber :may chamber'A. An intermediate partition or casbe maintained substantially uniform. ing 12 is interposed between the walls ofthe ster- A more specic object of the invention is to ilizing chamber 7 andthe outer insulated casing provide an oven of the general character de- 1 of the oven asshown in Fig. 1 of the drawing. 65jvr scribed having a novel baie structure directly It will be noticedby referring to Fig. 1 of the overlying the source of heat whereby the heat drawing-that anvinner air channel B is dened is concentrated at a point adjacent the bottom by the chamber walls 7 and the'partiton 12 andof the outer'and inner air channels and the steran outer air channel C is defined by said partichamber is maintained substantially uniform A plurality of apertures 13, constituting air inthroughout. l, f letports to the inner channel B are formed in' Certain other features and details of the-inthe bottom 3 of the oven. Communicationfrom vention are set forth hereinafter and disclosed the sterilizing chamber A to the outer air, chan- 2() in the accompanying drawing, inA which: Y nel C for a purpose set forth later, is gaforded by 75'y Figure 1 is aview in section vertically through a number of ducts or tubes lxconnected interthe hot air sterilizing oven constituting the presmediate the chamber walls 7 and partitions 12. ent invention; and. Y p 'e v A'gas burner 15 of substantially elongated con- Fig. 2 is a fragmentary View in section online figuration, is disposed adjacent the bottom ofthe 2 2, Fig. 1. v A outer air. channel C, and as shown in the draw- 80 Heretofore, in hot air sterilizing ovens of the ing, this burner extends about the two ends and general character set forth anddisclosed, it has rear side of the sterilizing chamber and the air been quite difficult tomaintain aY substantially channel `B surrounding rthe llatter. A baffle-16v uniform temperature at.` all points within the having a plurality of alignedvapertures 17 theresterilizing chamber, andoften timesla dineren-ce in, "as best shown in Fig. 2 ofv the drawing, is 35" in the temperature of `the hot air at the top of rigidly secured-inftheair channel C tothe outer said sterilizing chamber and the bottom thereof,l surface partition members 12 andextends tothe will be `as great as fronfi 20 vto`30" C., which is inner surface of the `outer insulated casing vl of very undesirable.v the oven, the said'baiiie structure substantially By the present inventiona hot airsterilizing overlyingthe name ports of the elongated gas 901 oven isprovided whereinY the temperature of the burner 15 andbeing inclined inwardly in the hot air circulating through the sterilizing chamdirection of the intermediate partition or wall ber is maintained substantially uniform throughstructure 12 as shown in Fig. 1 of the'drawing. out said Achamber with ainaximum temperature Y The particular'baie structurek 16 acts to retard 40 difference 0f apDTOXmateiy Only 3t0 4C.,Whi0h the upward .rise of heat. emanating from the 95 enables the, material being sterilized rto bey subrburners 15 and to fdeectand-.ooncentrate the. jected to a uniform heat treatment. same against the vadjacent surface of the parti-v Referring `now 'more particularly to the drawtion`12.'A The balile 16 isv also provided .with aper-.. ingy the 1100 ail SGelZiIlg Oven constituting the tures 17 to permit the air entering the channel C present invention comprises a-casing l covered from the chamber A through the ports 14, to 100 with a sheet or layer of asbestos or other suitable pass through the barile structure upwardly insulating material la, Which iS held irl DOSiiOn through said air channels C whence it is dissiby means of a thin sheet or binder 2. pated outwardly of 'the oven through the flue 5 A substantially solid bottom: 3 is provided for controlled by the damper 6 as shown in Fig. 1 of the casing 1 and the entire oven is mountedV or the drawing. 105.`

vrests upon legs or other supporting means 4 on The ovenrchamber is provided with the custhe under-side of said bottom. A flue 5 is protomary door or closure 18 to better maintain the vided in the top of the casing 1 and is equipped high temperatures within the chamber, and also with the usual damper 6. provision is made to facilitate determination of The oven is provided with inner partitions or the'temperature existing at any time therein. 110

In operation of the present invention, relatively cold air enters the ports 13 of the bottom 3 and enters the inner air channel B. The air passes the concentrated heat Zone at the bottom of the channel effected by the novel baiile 16 and the air is warmed in a relatively short time to a substantially high temperature, the said air subseduently passing upwardly through the air channel B through the apertures 9 in the roof structure 8 of the chamber and downwardly through said sterilizing chamber A whence it enters the outer air channel C by means of the ducts or tubes 14. connected between the 1bottom of the said sterilizing chamber A and said outer air channel C.

The position of the bafiie 16 functions to deflect the he'at from the source l5 against the ad jacent portion of the partition 12 to heat the latter to a high temperature and thus concentrate the heat at the bottom of the inner air channel B. The air entering the channel B is thus Vheated to a high temperature immediately on entering said channel, and concentration of heat in this manner also functions to raise the temperature at the bottom of the sterilizing chamber sufficiently to compensate or reheat the air which has a tendency tov cool during passage downwardly within the chamber after entering the latter from the channel B. The temperature of the hot air circulating through the chamber A is thus maintained substantially uniform and the material being sterilized may be subjected to a uniform heat treatment.

While the particular embodiment of the invention has been set forthy for the purpose of description, it is not intended that the invention be limited specically thereto, but mcdincations and changes may be made in the detail structure and form of the present device without ."departing from the spirit of the invention.

What is claimed is:

l. In a sterilizing oven, the combination with means defining outer and inner air channels and a chamber surrounded thereby, of a source of heat positioned adjacent the bottom of said outer air channel, and a baie disposed above said source to deflect the heat therefrom against the inner air channel and concentrating said heat at a point adjacent the entrance to the inner channel and the bottom of the chamber, whereby the temperature within said chamber is maintained uniform. .Y

2. In a sterilizing oven, the combination with an inner casing defining a sterilizing chamber, an exterior casing surrounding said inner casing, an

`intermediate casing between the inner and outer casings defining, together with said inner and exterior casings and outer air channels respectively-of a source of heat disposed adjacent the 'bottom of said outer air channel, and means disposed above said source to deflect the heat therefrom against the adjacent portion of the intermediate casing and concentrate said heat at a point adjacent the entrance to the inner air channel and the bottom of the chamber, wherebyY the temperature of the air circulating through said chamber .is maintained uniform.

3. In a sterilizing oven, the combination with an inner casing defining a sterilizing chamber, an exterior casing surrounding said inner casing, an intermediate casing between the inner and outer casings dening, together with said inner and exterior casings inner and outer air channels respectively, of a source of heat disposed adjacent the bottom of said outer air channel, and a baiiie rigidly disposed above said source to deflect the heat therefrom against the adjacent portion of the intermediate casing and 'concentrate said heat at a point adjacent the entrance to the inner air channel and the bottom of the chamber, whereby the temperature of the air circulating through said chamber is maintained uniform.

4. In a sterilizing oven, the combination with an inner casing defining a sterilizing chamber, an exterior casing surrounding said inner cas-` ing, an intermediate casing betweenthe inner and outer casings dening,-together `with said inner casing an inner air channel, and with the exterior casing an outer air channel, said-inner air channel having air inlet ports at the bottom thereof and communicating at the top with the sterilizing chamber, ducts connecting the bottom of said chamber and the outer air channel, of a burner disposed adjacent the bottom of said outer air channel, and inwardly inclined means above and in close proximity to said burner yto deiiect the heat therefrom againsty the adjacent portion of the intermediate casing-and concentrate said heat at a point adjacent the entrance to the inner air channel andthe bottom of the chamber whereby the temperature of the air cir'-Y culating through said chamber is maintained uniform. Y j

5. In a sterilizing oven, the combination withV an inner casing defining a sterilizing chamber, an exterior casing surrounding said inner casing, an, intermediate casing between the inner andouter casings dening, together with said inner casing an inner air channel, and with the exterior` casing an outer air channel, said inner air channel having air inlet portsat Vthe bottom thereof and communicating at the top with the steriliz'ing chamber, ducts connecting the bottom of said chamber and the outer air'channel, of a burner disposed adjacentthe bottom of said outer airv channel, and an inwardly inclined baffle vabove and in close proximity to` said burner to deflect the heat therefrom against the adjacent portion of the intermediate casing and concentrate said heat at a point adjacent the entrance tothe inner air channel and the bottom of thechamber' whereby the temperature of the air circulating through said chamber isA maintained uniform.

. JULIUS BOEKEL.

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